she played a role in the film.How interesting it is!
“a role she played in the film”代替了it,is省略了.再问一句，How silly the mistakes I had made.这句能拆开吗？这句话中是否省略了are?希望能详细说下！I had made the mistakes .How silly they are. the mistakes I had made(把silly形容的主语the mistakes 放在前面）代替了they。是省略了are。